Cosmetics and perfumes (chemistry part-2)
6. SUNTAN LOTION :- Sunlight possesses both beneficial and harmful effects on the skin . Exposure to moderate sunlight increases blood circulation , produces vitamin D in the body,kills germs and causes thickening of the skin to prevent sunburn .these are the main beneficial effects. However, long exposure may damage the skin producing erythema ( reddening ), painful burn,blister,swelling of the skin and something skin cancer . Some natural protection against sunburn is obtained by thickening of the skin due to increased rate of cell formation at the epidermis and also increased melanin content of the epidermis. The purpose of suntan lotion is to minimise the harmful effects of the sunlight and to assist tanning of the skin . The suntan lotions are chemicals which act as sunscreen to absorb at l...